JSTL - Core <fmt:setLocale> Tag


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The <fmt:setLocale> tag is used to store the given locale in the locale configuration variable.

Attribute

The <fmt:setLocale> tag has the following attributes −

Attribute Description Required Default
Value Specifies a two-part code that represents the ISO-639 language code and an ISO-3166 country code. Yes en_US
variant Browser-specific variant No None
scope Scope of the locale configuration variable No Page

Example

Resource bundles contain locale-specific objects. Resource bundles contain key/value pairs. When your program needs a locale-specific resource, you keep all the keys common to all the locale but you can have translated values specific to locale. Resource bundles helps in providing content specific to locale.

A Java resource bundle file contains a series of key-to-string mappings. The method that we focus on involves creating compiled Java classes that extend the java.util.ListResourceBundle class. You must compile these class files and make them available to the classpath of your Web application.

Let us define a default resource bundle as follows −

package com.tutorialspoint;

import java.util.ListResourceBundle;

public class Example_En extends ListResourceBundle {
   public Object[][] getContents() {
      return contents;
   }
   static final Object[][] contents = {
      {"count.one", "One"},
      {"count.two", "Two"},
      {"count.three", "Three"},
   };
}

Let us now define one more resource bundle which we will use for Spanish Locale −

package com.tutorialspoint;

import java.util.ListResourceBundle;

public class Example_es_ES extends ListResourceBundle {
   public Object[][] getContents() {
      return contents;
   }
   static final Object[][] contents = {
      {"count.one", "Uno"},
      {"count.two", "Dos"},
      {"count.three", "Tres"},
   };
}

Let us compile the above classes Example.class and Example_es_ES.class and make them available in the CLASSPATH of your Web application. You can now use the following JSTL tags to display the three numbers as follows −

<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>
<%@ taglib uri = "http://java.sun.com/jsp/jstl/fmt" prefix = "fmt" %>

<html>
   <head>
      <title>JSTL fmt:setLocale Tag</title>
   </head>

   <body>
      <fmt:bundle basename = "com.tutorialspoint.Example">
         <fmt:message key = "count.one"/><br/>
         <fmt:message key = "count.two"/><br/>
         <fmt:message key = "count.three"/><br/>
      </fmt:bundle>

      <!-- Change the Locale -->
      <fmt:setLocale value = "es_ES"/>
      <fmt:bundle basename = "com.tutorialspoint.Example">
         <fmt:message key = "count.one"/><br/>
         <fmt:message key = "count.two"/><br/>
         <fmt:message key = "count.three"/><br/>
      </fmt:bundle>

   </body>
</html>

The above code will generate the following result −

One 
Two 
Three
Uno
Dos
Tres

Check <fmt:bundle> and <setBundle> tags to understand the complete concept.


jsp_standard_tag_library.htm

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